Dry separating table



Aprillo, 1928. 1,885,8249

R. W. ARMS DRY SEPARATING TABLE Filed May 1. l924 2 Sheets-S'neet 2 Patented Apr. 10, 1928.

` UNITED sTA'rEs 'PATEN'i' i orFiicn.

v RAY W. ARMS, 0B' CHICAGO, ILLINOIS; .ASSIGNOR T0 ROBERTS AND SHAEFER COMPANY,

O1? CHICAGO, ILLINOIS, 'A CORPORATION OF ILLINOIS.

DRY SEPARATING TABLE.

Application filed May 1, 1924. Serial No. 710,219.

i across which the material is to be fed to the separating table so as to provide throughout the area of the table a regular and controlled flow of air without eddying cross currents and the like which might otherwise interfere with the air cleaning or separation operation.

Another object is to provide an air chimney which transforms the pressure of the air from Velocity pressure to static head at the oint at which the air does its work on the owing sheet or stream of granular material which is being classified.

Another object is to provide a chimney which distributes air uniformly to all parts of the deck surface without recourse to interior baflies, thus making it possible to keep the path of the air current free from obstruction thereby saving power, the chimney being gradually flared upwardly from the point at which the air enters the table assembly to the point at which the air is fed to the underside of the table or deck. The change in cross sectional area being gradual so as to conform to the Shape of the deck at the top and the shape of the air duct or fan discharge port at the bottom.

Another object is to provide a connection between the chimney and the deck or table at the upper end of the chimney so as to reduce the weight of the reciprocating parts. Another object is to provide a compact assembly of fan, air blower and table. Other objects will appear from time to time inthe specification and claims.4 My invention is illustrated more or less diagrammatically in the drawings, whereinw Figure 1 is a plan view; iFigure 2 is a side elevation vwith parts in section showing the table, chimney, bellows connection and fan;

Figure 3 is a section along the line 3-3 of Figure lz taken through the chimney;

Figure 4 is a top plan view of the chim-` igure 5 is a section along the lines 5-5 of Figs. 2 and 3; w Figure 6 is a side elevation showing an air duet substituted for the fan.

Like parts are indicated by like characters throughout the specification and drawings.

A is a. supporting frame-work or bed. A.1 A1 are bearings mounted thereoncarrying an-eccentric shaft A2 driven by a pulley A3 and belt A4 from any suitable source of power not here shown. A5 is a dry cleaning screen or table deck frame. It has on its upper surface a screen A6 to which material to be cleaned or treated may be fed through any suitable supply source A7. This table is supported on t e bed by links A. A'9 is an eccenti'ic rod extending from the eccentric A10 on the eccentric shaft to the table to oscillate or reciprocate it on the links. A11 is an adj ustable support for the links on one end of 'the table whereby the angle of inclination of the table may be changed or adjusted.

B is a fan mounted on the underside of the main support adapted to be driven by any suitable power through a pulley B1 and belt B3. 'B4 is a dischargeport of the fan.

B5 is a gradually expandlng chimney extending upwardly from the discharge port of the fan and of the same cross sectional area and shape there as at its lower extremity. This chimney extends upwardly and outwardly terminating just abovethe top of the frame-work and i's rigidly mounted on the frame-work. This chimney at its upper mouth B6 conforms in cross sectional area and shape to the screen surface of the deck. B7 is a bellows of cloth, rubber or other suitable flexible material interposed between the upper mouth of the chimney and the bottom of the deck, the bellows being attached to the deck around and conforming closely to the shape and cross sec- .tional area of the open screen deck surface. accompanying In a modified form, the pipe C may be substituted for thel fan and air may be fed through that pipe through any suitable source not necessarily intimately connected with the assembly.

the cross sectional'area of the upper end of the Evasee chimney might beof difierent cross sectional area from the screen though its shape would always be substantially the same. In such case the bellows would bridge 'the gap between the, screen and the chimney and take care of any expansion or contraction of the air current.

ndei' some conditions Itwill be evident that while I have shown an operative device, still many changes might be made inw the size, shape and disposition of parts without departing materially from the spirit of my invention. I wish, therefore that my showing be taken as in a Sense, diagrammatic.

Experience has shown that if the Evasee chimney which I ropose to use to lead the air from the inta e or supply point to the deck is made with` a very gradual taper eddying and turbulence will be minimize and baflles to distribute the air over the entire area of the deck in the chimney may be dispensed with but when the angle of inclination of the walls of the chimney with respect to the central axis becomes greater than forty de rees, this effect is negative across the table.

and the use o baflles becomes imperative. I propose, therefore, that in my'chimney the wall shall be inclined to the axis less than fort degrees.

T e use and operation of my invention are as follows:

In starting up the table, the eccentric shaft and the fan will be started to cause the table to reciprocate on its link support and to cause the fan to rotate driving a column of air upwardly through the chimney, through the bellows and through the screen surface of the table or deck. Material is fed to the table through the chute and since the table is inclined as indicated, this materialtends to move downwardly and laterally across the table. The riflles .as shown or any other suitable means which may be desired, tend to resist the downward and encourage thev lateral movement of material The reciprocating action of the screen tends to feed material in the general direction of the riflies. The vibratory action tends to vibrate the material, lift both the riflies and ermit travel downwardly across them. he air current exerts a greater 1ifting`efl`ect on the lighter particles than itdoes on the heavier ones. vThe tendency is for the lighter particles to ride over the riflles and the heavier ones to stay behind them and to move across the deck while the lighter particles move ldiag- '65 `'tion of the material with the lighter particles tending to flow at a more or less sharp a'ngle to the riflies, and the heavier particles Vtending to flow longitudinally along the I'iffles. The riflles de'cre'ase .in height toward the discharge end of theV table, as'indiaed, so

that as the material moves downwardly to- Ward it, there is a tendency' for more and more heavier particles to move across the riffles. The result of this is that the material is first stratified on the face of the table and :Mama

'then fed across it. The lighter particles come off the table on the left hand side and the heavier particles come off the table on the right hand side as shown in Figure 1, even clear around the u er side thereof.

This results in a classi cation of material because the material running off the table can "be classified as desired, the lighter particles or coal falling into one bin, the middlings or particles Apartly coal or refuse,

falling into another bin and the heavier refuse particles which are stone and the like falling into a third bin.

' While air is the gas normally ropelled' that other materials might be and have been separated or treated by my apparatus,

I have shown a fan discharging directly into the chimney. Obviously a pipe might be substituted for this fan and air be fed to the chimney from any suitable source ada ted to su ply air under pressure. Un er some con itions also the cross sectional area of the upper end of the Evasee chimney might be different from the screen, it might be smaller though it would preferably al: ways be of substantially thesame shape, in which case, the bellows would be tapered and would bridge the gap between the chimney, and it is even possible that under some conditions, it might be desirable to have the upper extremity of the bellows larger than the screen in which case the bellows Would be tapered in the opposite direction.

I claim:

1. In an air cleaning table, a material supporting deck, having an irregularly shaped air pervious surface, means for feeding a continuous supply of fragmentary material thereto, and means for vibrating the deck to feed such material thereacross in a continuous flowing sheet, meansv for feeding a blast of air upwardly through the deck andthe bed of materialV thereon, comprising an air supply pipe located and terminating below the deck, a fixed, rig'id funnel leadin from the discharge end of, the` pipe upwar ly to- Ward the under side of the deck and expanding gradually from general conformity with `the supply pipe to accurate conformity with the size and Shape of the pervious surface of the deck in a plane immediately below the deck, a bellows joining the extreme upper end of the funnel and the pervious portion of the deck, the body of the bellows being substantially parallel at all points with the gati of air flow from the funnel end to the 2. The device of claim 1, charaoterized by 5 the fact that the central points of the polygons formed by the intersection of the upper and lower extremities of the funnel respectively with horizontal planes, and the central point of vthe polygon defining the pervious deck are all located on the same 10 Vertical line.

Signed at Chicago, county of Cook and Sie of Illinois, this .12th day of April,l 1

RAY W. ARMS. 

